CN100365200C - Process and device for inflation suspension - Google Patents

Process and device for inflation suspension Download PDF

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Publication number
CN100365200C
CN100365200C CNB2004100035539A CN200410003553A CN100365200C CN 100365200 C CN100365200 C CN 100365200C CN B2004100035539 A CNB2004100035539 A CN B2004100035539A CN 200410003553 A CN200410003553 A CN 200410003553A CN 100365200 C CN100365200 C CN 100365200C
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China
Prior art keywords
unit
washer
washing process
suspension
loop
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Expired - Fee Related
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CNB2004100035539A
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Chinese (zh)
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CN1517488A (en
Inventor
H·加布尔
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Andritz AG
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Andritz AG
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1468—Discharge mechanisms for the sediments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)

Abstract

The invention relates to a process for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions, with one or more stages and/or cells P1, P2, P3, P4, S1, S2, where each stage/cell P1, P2, P3, P4, S1, S2 has its own separate liquid loop 6. In order to improve ash removal, the invention provides for a washing process 12, 12', 16, 18 being interposed. In addition, the invention relates to a device for implementing the process.

Description

Be used to inflate the process and the device of suspension
Technical field
The present invention relates to be used to inflate the process of suspension, particularly will the flotation in the deinking of for example pulp suspension of inflation suspension by one or more stage and/or unit, wherein, each stage/unit has its oneself fluid loop independently.In addition, the present invention relates to be used to realize the device of this process.
Background technology
Such process is known from EP 1 124 001 A2 for example, and wherein, each flotation stage can also be according to for example US 4,255,262, EP 0 243 690, DE 31 20 202 or US6, and 208,549 design.
Such process is used for removing impurity and printing-ink particle, particularly those impurity that produce and printing-ink particle in Waste Paper Handling from pulp suspension.By using such process, realized that mineralogical composition (for example, filler etc.) nonspecific removal, because their chemical surface property (particularly filler) makes them different with the reaction of ink particle in the pulp suspension, these ink particles relatively easily become hydrophobic.In addition, the proportion of mineralogical composition is than high about 2 to 3 times of the proportion of ink particle.Yet, in known procedures, some shortcomings appear in selective floation.For example, if we attempt to set the goal for removing filler by this process is carried out some variation, the decrease in efficiency that always causes printing-ink to be removed so like this, this cause need be in inflation extra variation, fluctuation is regulated to raw material, and changes conveying capacity.And, if increase spill-out for the clearance that improves mineral matter, the fiber loss rising of equal proportion therewith so, this causes the expense of disposal cost and needed raw material bigger.
Summary of the invention
The objective of the invention is to reduce or avoid above-mentioned shortcoming, keep identical flow process and inflation simultaneously.
Therefore, the invention is characterized in the introducing washing process, wherein, this washing process be directed into a unit, in the fluid loop of for example elementary or secondary unit, perhaps introduces the unit between the stage, that is, and and between the elementary and secondary unit.As a result, can be optionally and remove dust burdening simply.
If be diluted to the concentration of the concentration, particularly 0.8-1.3% of about 0.6-1.4% entering solid suspension before the secondary unit, can increase flotation efficiency so.
According to further favourable development of the present invention,, so further can improve ash disposal fully if introduced a washing process in the loop of two unit respectively at least.
If the acceptance stream from least two washing process supplies to another washing process (so-called dual washing) together at this, under the fiber loss that reduces, can realize the further increase of the removal amount of ash so.
These at least two washing process are introduced in the loop of primary unit and prove particularly advantageous.
The filer content that enters be approximately 23% and more situation under, have less than about 20% from the reception thing of whole process, it is favourable being preferably lower than 15% dust burdening.As a result, this reception thing can turn back to the process with low fiber loss once more.
And, the present invention relates to be used to inflate the device of suspension, particularly will the flotation in the deinking of for example pulp suspension of inflation suspension by one or more stage and/or unit, wherein, each stage/unit has its oneself fluid loop independently.According to the present invention, this device is characterised in that has introduced washer, and wherein, this washer can be incorporated in the fluid loop of a unit, for example elementary or secondary unit, and/or these unit are between the stage, that is, and between elementary and secondary unit.
According to the present invention,, so further can improve the removal of grey filler fully if introduce at least one washer in the loop of two unit respectively.
If the flow of accepting from least two washers supplies to another washer together at this, can realize the further increase of the removal of ash so.
By back washing, can realize further reducing fiber loss and reduce volume flow simultaneously from the flotation washing system to the waste streams collected.
And, in the primary unit loop, introduce at least two washers and prove and have superiority.
If this washer or a plurality of washer are designed to have the rotary scrubber of vertical rotating shaft, what perhaps substitute is designed to the scroll washing device, can cause favourable structure so.
Description of drawings
Use the example in the accompanying drawing to describe the present invention now, wherein
Fig. 1 shows the floatation equipment of state-of-the art;
Fig. 2 has illustrated distortion of the present invention;
Fig. 3 comprises another distortion of the present invention;
Fig. 4 shows particularly advantageous distortion of the present invention;
Fig. 5 comprises the distortion of washer;
Fig. 6 is another distortion of washer;
Fig. 7 is the material balance according to state-of-the art; And
Fig. 8 is the material balance according to the distortion of the present invention shown in Fig. 3.
The specific embodiment
Fig. 1 comprises four primary unit P1, P2, P3 and the P4 of having according to state-of-the art, and the schematic diagram of the floatation equipment of two secondary unit S1 and S2.Pulp suspension stream Z enters first primary unit P1 at suitable point.By with the loop 1 that supply with to disconnect by adding air L and the syringe 2 that air is sneaked into suspension is produced bubble in this unit.Whole floatation equipment is full of suspension in large quantities, forms foam at the surperficial O of suspension, and this foam comprises material and the ink particle that will remove by flotation as much as possible.In primary unit P1, be cleaned with the acceptance stream of removing printing ink and impurity and transfer to second primary unit P2 by the opening 5 that is positioned at dividing wall 10 bottoms.In all other primary units, use by the bubble generation syringe of internal element circuit operation and handle this suspension in an identical manner, and discharge as receiving thing G in the end of this equipment.The foam of collecting from all primary unit P1 to P4 can be discharged to downwards the container 4 from foam passage 3.Overflow from this intermediate receptacle 4 supplies to secondary unit S2, is removed in large quantities simultaneously by this overflow foam.Here inflate once more around internal element loop 6.From secondary unit S2, accepted thing is transferred to secondary unit S1 by the opening 7 that is positioned at the bottom.After using loop 8 inflations, can be used as overflow U from the foam of secondary unit and be removed.Opening 9 from the accepted thing of the secondary unit S1 dividing wall 11 by being arranged in the bottom enters first primary unit P1.
As basic principle, can introduce at several points according to the washing stage of the present invention.This washing stage be directed in primary unit, secondary unit or the loop between elementary and secondary stages.
Fig. 2 shows the washing stage that is incorporated in primary stage and the secondary stages.According to desired process control and cleaning requirement, washer 12 is installed in one of primary unit (P1, P2, P3, P4) and locates.Substitute as a kind of, perhaps as additional, a washer 12 ' be directed in the loop of secondary unit (S1, S2).As an example, Fig. 2 shows at the washer 12 at P2 place with at the washer 12 ' at S2 place.Washer 12,12 ' is installed in the downstream of syringe pump 13.Compare with state-of-the art, in the present invention, syringe pump 13 provides higher pressure output under the situation of identical conveying capacity.Will therefrom remove the shunting of the liquid of ash discharged near the bottom of unit P2, S2 before inclusions enters next unit, and remove in washer 12,12 ' that the shunting of liquid enters identical unit after the ash, and set the concentration of this slurry by diffuser 14,14 '.Also may between the plurality of units chamber, comprise the washing stage.Filler of removing in washer 12,12 ' and chip (mainly being ash) are transported to sewage disposal device.The removal degree of ash can be set by common machine parameter.According to state-of-the art as shown in Figure 1,, can also in the commodity slurry, adjust the removal degree of ash by being independent of the flow that product is provided with syringe.
According to the present invention, if require the supply forward of entire product stream, if perhaps the washing stage be installed in existing DIP (deinked stock) equipment, can also from the whole stream between the unit, remove grey so.In order to keep flotation efficiency, the loop must be opened, and slurry concentration further dilutes, and preferably is diluted to about 0.8 to 1.3%.
In Fig. 3, to handle in to the aliment 15 of secondary unit as the washer 16 of ash handling equipment, feasible removal owing to ash and chip has reduced the waterpower load in the secondary unit.Yet the basic sides here is to remove ash.The material balance that in Fig. 7, shows the state-of-the art structure, the material balance of demonstration structure of the present invention in Fig. 8.Shown the shunting washing of effective form in distortion shown in Fig. 3, because during floatation process, foam has been rich in mineral matter significantly.
In ash removal process, the accepted thing thickening.In order to ensure slurry concentration in the secondary flotation is not too high, and this pulp suspension is diluted to about 0.6 to 1.4% usually.The grey removal program of in flotation stage all needs this process.
Another potential device of removing ash shows in Fig. 4.Here, ash is removed in two shuntings.In order further to reduce fiber loss, this ash is removed unit 17,17 ' series connection.Emptying at present filler and deliver to flotation froth container 4 from the accepted thing of next washer 18, and carry out further flotation with the foam that overflows from the primary unit to the secondary unit.The discarded object that comprises high concentration filler and chip is handled in DAF (dissolved air floatation) unit or material slag squeezer.
Fig. 5 shows a kind of potential distortion of the grey removal device of rotary scrubber 20 forms.Suspension supplies to washer 20 by supplying with branch 21.The suspension flow that standing finish 22 will have favourable fluid behaviour deflects into solid cylindricality filter basket 23 inside.Have parabola shaped circulator 24 and thin slice 25 in this zone existence.Accepted thing through filter 23 is collected in receiving area 26, and by receiving outlet 27 dischargings.Circulator 24 is driven by driver 28.Such unit has by favourable flow process, particularly the low-yield loss of this parabola shaped circulator realization.Using the design of special filter and thin slice can obtain high-caliber ash removes.
Fig. 6 shows the another kind of structure as the washer of roller washer 30.Suspension is supplied with by so-called headbox 31, and suspension injects between cylinder 32 and the filter 33 by this headbox.Filter 33 is driven by driven roller 34, and filter liquor discharges by filtering emission 35, and this filter liquor is an accepted thing.
Fig. 7 shows the slurry stream in a kind of floatation equipment 40 of state-of-the art.The floatation equipment here comprises primary unit 41 and secondary unit 42.Suspension is supplied with 43 and is supplied to primary unit 41, and overflow 44 is delivered to secondary unit 42 from primary unit 41.Accepted thing 45 is transported from primary unit 41, and the overflow 46 that has concentrated solid is simultaneously taken away from secondary unit 42.Some some places in system add more shower waters 47.The value of each slurry stream shows in following form 1.
Table 1
Stream Numbering Volume flow, gross weight [1/min] Solids content [%] Relative dust burdening [%] in the solid
Supply with 43 15000 1.2 25.0
Return stream 44 3200 1.07 66.0
Flow/reception thing 45 15500 1.07 21.2
Discharge capacity/spill-out 46 550 2.55 70.0
Shower water 47 1050 - -
Fig. 8 shows from the slurry stream according to the floatation equipment 40 with primary unit 41 and secondary unit 42 of Fig. 3.Suspension is supplied with 43 and is supplied to primary unit 41, and overflow 44 is delivered to grey removal device from primary unit 41, particularly delivers to washer 48." accepted thing " 49 from washer 48 is reduced to less than 1% by adding dilution water 52 concentration, and supplies to secondary unit 42 at 53 places.Mix with overflow 46 from the stream of the high filler load 50 of having of washer, and discharge from system as total overflow 51 from two sub-cells 42.The value of each slurry stream shows in following form 1.
Table 2
Stream Numbering Volume flow is [1/min] altogether Solids content [%] Relative dust burdening [%] in the solid
Supply with P1 43 15000 1.2 25.0
Foam drainage from primary unit 44 2550 1.11 64.8
Flow/reception thing 45 14480 1.11 17.2
Spill-out from two sub-cells 46 30 2.3 72.7
Shower water 47 1100 - -
Return stream after the washer 48 49 240 3.9 14.7
Discharging after the washer 48 50 2300 0.8 89.5
Total spill-out 51 2330 0.8 88.9
Dilution water 52 720 - -
Return flow to two sub-cells 53 960 0.97 14.7
Comparison sheet 1 and 2 is very clear, and under the situation of identical solid and ash input, process according to the present invention provides has reception thing more highly filled and lower relative dust burdening.Like this, compare, almost discharged the many ashes of twice with the process of state-of-the art.
If this equipment also is equipped with the other washer that is used to shunt,, can obtain so even better grey clearance for example according to Fig. 2 or 4.
The filler of removing big percentage from product stream also has positive effect, that is, removed extraly by the difficult little ink particle of removing of flotation.As a result, brightness and whiteness have also been increased.

Claims (27)

1. by one or more stage and/or the unit method to the suspension inflation, wherein, each stage/unit has its oneself fluid loop independently, it is characterized in that: introduced washing process.
2. method according to claim 1 is characterized in that: the described suspension of flotation.
3. method according to claim 2 is characterized in that: to the pulp suspension deinking.
4. method according to claim 1 is characterized in that: this washing process is introduced in the fluid loop of at least one unit.
5. method according to claim 4 is characterized in that: this washing process is introduced in fluid loops primary unit or two sub-cells.
6. method according to claim 1 is characterized in that: introduce described washing process between the stage in these unit.
7. method according to claim 6 is characterized in that: described washing process be introduced into elementary and secondary unit between.
8. method according to claim 6 is characterized in that: entering before this secondary unit, this solid suspension is diluted to the concentration of 0.6-1.4%.
9. method according to claim 8 is characterized in that: entering before this secondary unit, this solid suspension is diluted to the concentration of 0.8-1.3%.
10. according to a described method in the claim 1 to 9, it is characterized in that: in each loop of two unit, introduce a washing process at least.
11. method according to claim 10 is characterized in that: the reception stream from least two washing process supplies to another washing process together.
12. according to claim 10 or 11 described methods, it is characterized in that: the waste streams from described one or more washing process supplies to another washing process together.
13. a described method according in the claim 10 to 12 is characterized in that: these at least two washing process are introduced in the loop of primary unit.
14. a described method according in the claim 1 to 13 is characterized in that: the filer content that enters be 23% or more situation under, have dust burdening from the accepted thing of this whole process less than 20%.
15. method according to claim 14 is characterized in that: described accepted thing has the dust burdening less than 15%.
16. suspension is inflated device with flotation by one or more stage and/or unit (P1, P2, P3, P4, S1, S2), wherein, each stage/unit (P1, P2, P3, P4, S1, S2) has its oneself fluid loop (6) independently, it is characterized in that: introduced washer (12,12 ', 16,18).
17. device according to claim 16 is characterized in that: this washer (12,12 ') is introduced in the fluid loop of a unit (P1, P2, P3, P4, S1, S2).
18. device according to claim 17 is characterized in that: this washer (12,12 ') is introduced in fluid loop primary unit or secondary unit.
19. device according to claim 16 is characterized in that: introduce described washer (16) between the stage in these unit.
20. device according to claim 19 is characterized in that: described washer (16) be introduced in elementary and secondary unit between.
21. device according to claim 20 is characterized in that: dilution water pipe (52) is connected on the pipe between washer (16) and two sub-cells (S1, S2).
22. a described device according in the claim 16 to 21 is characterized in that: in the loop (6) of two unit, add a washer (12,12 ') at least respectively.
23. device according to claim 22 is characterized in that: the reception stream from least two washers (12,12 ') supplies to another washer (18) together.
24. according to claim 22 or 23 described devices, it is characterized in that: the waste streams from these at least two washers (12,12 ') supplies to another washer together.
25. a described device according in the claim 22 to 24 is characterized in that: these at least two washers (12,12 ') are introduced in the loop (6) of primary unit (P1, P2, P3, P4).
26. a described device according in the claim 16 to 25 is characterized in that: described washer (12,12 ', 16,18) is designed to have the rotary scrubber (20) of vertical rotating shaft.
27. a described device according in the claim 16 to 26 is characterized in that: described washer (12,12 ', 16,18) is designed to roller washer (30).
CNB2004100035539A 2003-01-24 2004-01-29 Process and device for inflation suspension Expired - Fee Related CN100365200C (en)

Applications Claiming Priority (2)

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ATA89/2003 2003-01-24
AT0008903A AT412216B (en) 2003-01-24 2003-01-24 METHOD AND DEVICE FOR VENTILATING SUSPENSIONS

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CN1517488A CN1517488A (en) 2004-08-04
CN100365200C true CN100365200C (en) 2008-01-30

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US (2) US20040222161A1 (en)
EP (2) EP1441064A1 (en)
CN (1) CN100365200C (en)
AT (2) AT412216B (en)
BR (1) BRPI0400119A (en)
CA (1) CA2454737A1 (en)
MX (1) MXPA04000701A (en)
NO (1) NO20040310L (en)

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DE102009045965A1 (en) * 2009-10-23 2011-04-28 Voith Patent Gmbh Process for removing solids from a pulp suspension by flotation
DE102015201996A1 (en) * 2015-02-05 2016-08-11 Voith Patent Gmbh Pulp treatment

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NO20040310L (en) 2004-07-26
CA2454737A1 (en) 2004-07-24
ATE528439T1 (en) 2011-10-15
EP1441064A1 (en) 2004-07-28
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US20080296206A1 (en) 2008-12-04
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